HSSC-II PHY CHP 12,13

The SI unit of magnetic flux is

• NmA-1
• NA-1m-1
• Nm2
• Vm

When a coil rotates in magnetic field the induced current in it

• Continuously changes
• Remains same
• Becomes zero
• Becomes maximum

The property of medium which affects the magnitude of force between charges is called

• constant
• Relative permittivity
• permittivity
• field

The device in which induced emf is statically induced emf

• AC generator
• transformer
• dynamo
• alternator

For induced emf in a coil the basic requirement is that

• Flux should link the coil
• Change in flux should link the coil
• Coil should form a close loop
• Both B and C are true

Which of the following quantity remain constant in step up transformer

• Current
• voltage
• power
• heat

The electrical energy converted into heat energy is given by the expression:

• IRt
• I2Rt
• VI2t
• I2R

A straight current carrying conductor experiences maximum magnetic force in a uniform magnetic field when it is placed ____________ to the field

• parallel
• perpendicular
• inclined
• At 1800

In choke coil, the reactance XL and resistance R are related as

• XL = R
• XL >>R
• XL << R
• XL = 0

In AC we generate sine wave form because

• It can be easily draw
• It produces least disturbance in electrical circuit
• It is nature standard
• Other waves cannot be produced easily